Polyaromatic Nanotweezers on Semiconducting Carbon Nanotubes for the Growth and Interfacing of Lead Halide Perovskite Crystal Grains in Solar Cells
Polyaromatic Nanotweezers on Semiconducting Carbon Nanotubes for the Growth and Interfacing of Lead Halide Perovskite Crystal Grains in Solar Cells
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DOI：
10.1021/acs.chemmater.0c01011
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发表时间：
2020-06-23
影响因子：
8.6
通讯作者：
Maruyama, Shigeo
中科院分区：
文献类型：
--
作者：
Lin, Hao-Sheng;Okawa, Shunhei;Maruyama, Shigeo
钙钛矿晶体晶粒尺寸控制、晶界钝化和晶粒桥接是在钙钛矿太阳能电池中获得高效率的关键。在钙钛矿活性层中添加少量半导体单壁碳纳米管可以实现这一点。特别是表面活性剂对附着在单壁碳纳米管上的半导体有着至关重要的作用。在这项工作中，我们合成了一种新型表面活性剂4，6-二（蒽-9-基）-1，3-亚苯基双（二甲基氨基甲酸酯），其一端具有多芳基，另一端具有脲类似物氨基甲酸酯基团。多芳族蒽末端起到纳米镊子的作用，通过π-π相互作用强烈地夹紧碳纳米管，而氨基甲酸酯末端与Pb 2+相互作用，起到强刘易斯碱的作用。此外，新型表面活性剂具有合适带隙的共轭双键，从而增强钙钛矿薄膜中的电荷迁移率。总的来说，与常规脱氧胆酸盐表面包绕的半导体单壁碳纳米管相比，新的表面包绕的半导体碳纳米管在钙钛矿太阳能电池中作为钝化剂和电荷桥显示出上级有效性。新的表面附着的半导体碳纳米管添加NH3 CH 3 PbI 3基钙钛矿太阳能电池表现出20.7%的功率转换效率，高于没有添加剂的参考器件（18.4%）和先前报道的半导体单壁碳纳米管添加器件（本工作中为19.7%，文献中为19.5%）。
Perovskite crystal grain size control, grain boundary passivation, and grain bridging are the keys to obtaining high efficiency in perovskite solar cells. A small amount of semi-conducting single-walled carbon nanotubes added to a perovskite active layer can achieve this. In particular, the surfactants attached to the semiconducting single-walled carbon nanotubes a crucial role. In this work, we synthesized a new surfactant, 4,6-di(anthracen-9-yl)-1,3-phenylene bis(dimethylcarbamate), which has a polyaromatic group on one end and a urea-analogue carbamate group on the other end. The polyaromatic anthracene end functions as a nanotweezer clenching the carbon nanotubes strongly via pi-pi interaction while the carbamate end interacts with Pb2+, functioning as a strong Lewis base. In addition, the new surfactant has conjugated double bonds with a suitable bandgap, resulting in enhanced charge mobility in the perovskite film. Overall, the new surfactant-clenched semiconducting carbon nanotubes showcase superior effectiveness as passivators and charge bridges in perovskite solar cells as compared to the conventional deoxycholate surfactant-wrapped semiconducting single-walled carbon nanotubes. The new surfactant-attached semiconducting carbon nanotube-added NH3CH3PbI3-based perovskite solar cells exhibited a power conversion efficiency of 20.7%, which is higher than that of the reference devices with no additives (18.4%) and the previously reported semiconducting single-walled carbon nanotube-added devices (19.7% in this work and 19.5% in the literature).